Both Smart Tech and uBreakiFix use OEM quality parts, or, Original Equipment Manufacturer which is basically the same quality parts as the cell phone manufacturers use.
Apple Stores will also fix broken screens. New screens will run $129 - $279 including the iPhone X.
You could also try fixing your phone yourself. Sites like iFixit.com provide how-to videos. But Krecak warns, beware! "It would sort of be like the dentist giving you the drill and saying, 'hey, why don't you drill your own cavity' right?"
Another common problem with cell phones: a wet phone. Siegler said once you get water in it, power it down immediately.
He said you can then try putting the phone in a bag of rice but, "it could take up to a week to get water out of it but if we open it up we can clean out that water."
Bad batteries are another common issue. If your phone is always dying it could be how you charge it. Siegler recommends you stick with the USB connections and avoid the cheap, gas station car charges that can actually overcharge your battery.
"You don't want to use an after-market charger on an iPhone. That is basically like putting a turbo charger in an engine," he said.
For more information about each of the companies mentioned click on the links below.